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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class IS_IN_SET</h1><span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_IN_SET">source&nbsp;code</a></span><br /><br />
<pre class="base-tree">
object --+    
         |    
 <a href="web2py.gluon.validators.Validator-class.html">Validator</a> --+
             |
            <strong class="uidshort">IS_IN_SET</strong>
</pre>

<dl><dt>Known Subclasses:</dt>
<dd>
    <a href="web2py.gluon.validators.IS_IN_SUBSET-class.html">IS_IN_SUBSET</a>
</dd></dl>

<hr />
example:
<pre class="literalblock">
   INPUT(_type='text', _name='name',
         requires=IS_IN_SET(['max', 'john'],zero=''))
</pre>
  the argument of IS_IN_SET must be a list or set
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET([<span class="py-string">'max'</span>, <span class="py-string">'john'</span>])(<span class="py-string">'max'</span>)
<span class="py-output">('max', None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET([<span class="py-string">'max'</span>, <span class="py-string">'john'</span>])(<span class="py-string">'massimo'</span>)
<span class="py-output">('massimo', 'value not allowed')</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET([<span class="py-string">'max'</span>, <span class="py-string">'john'</span>], multiple=True)((<span class="py-string">'max'</span>, <span class="py-string">'john'</span>))
<span class="py-output">(('max', 'john'), None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET([<span class="py-string">'max'</span>, <span class="py-string">'john'</span>], multiple=True)((<span class="py-string">'bill'</span>, <span class="py-string">'john'</span>))
<span class="py-output">(('bill', 'john'), 'value not allowed')</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET((<span class="py-string">'id1'</span>,<span class="py-string">'id2'</span>), [<span class="py-string">'first label'</span>,<span class="py-string">'second label'</span>])(<span class="py-string">'id1'</span>) <span class="py-comment"># Traditional way</span>
<span class="py-output">('id1', None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET({<span class="py-string">'id1'</span>:<span class="py-string">'first label'</span>, <span class="py-string">'id2'</span>:<span class="py-string">'second label'</span>})(<span class="py-string">'id1'</span>)
<span class="py-output">('id1', None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span><span class="py-keyword">import</span> itertools
<span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET(itertools.chain([<span class="py-string">'1'</span>,<span class="py-string">'3'</span>,<span class="py-string">'5'</span>],[<span class="py-string">'2'</span>,<span class="py-string">'4'</span>,<span class="py-string">'6'</span>]))(<span class="py-string">'1'</span>)
<span class="py-output">('1', None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>IS_IN_SET([(<span class="py-string">'id1'</span>,<span class="py-string">'first label'</span>), (<span class="py-string">'id2'</span>,<span class="py-string">'second label'</span>)])(<span class="py-string">'id1'</span>) <span class="py-comment"># Redundant way</span>
<span class="py-output">('id1', None)</span></pre><br /><br />

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        <span class="summary-sig-arg">theset</span>,
        <span class="summary-sig-arg">labels</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">error_message</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">value not allowed</code><code class="variable-quote">'</code></span>,
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">theset</span>,
        <span class="sig-arg">labels</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">error_message</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">value not allowed</code><code class="variable-quote">'</code></span>,
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